Endoscopic Treatment of Arachnoid Cysts

Abstract

Arachnoid cysts are a congenital malformation, secondary to splitting or duplication of the arachnoid that becomes filled with CSF [1]. They typically arise within the arachnoidal cisterns, in most cases in the middle fossa at the sylvian fissure (30–50 %). Ten percent arise on the hemisphere convexity, 10 % in the suprasellar cistern, 10 % in the quadrigeminal cistern, 10 % in the cerebellopontine angle, and 10 % in the midline of the posterior fossa [1]. Midline cysts (suprasellar, interhemispheric, quadrigeminal, and posterior fossa) are usually associated with hydrocephalus and present earlier in life, usually during the first 10 years.